Lancaster Municipal Code Art. II Drainage Facilities

Except as otherwise provided in this title, all subdivisions shall comply with the requirements of this article.

(Ord. 661 § 1 (610.200), 1994)

A hydrology study shall be submitted and approved prior to the filing of the final map. The hydrology study shall verify, among other things, that the proposed streets and existing downstream streets are designed to carry a fifty (50) year storm, top of curb to top of curb, and one hundred (100) year storm within the right-of-way. The anticipated flow through the subdivisions and/or potential drainage problems will be mitigated through the installation of drainage structures such as culverts, storm drains, or other improvements. Review and approval of the hydrology study shall be the responsibility of the city engineer.

(Ord. 661 § 1 (610.210), 1994)

The subdivider shall be responsible for the installation of improvements to mitigate storm and nuisance water runoff attributable to the subdivision, and for providing protection of the property and adjacent projects from flooding. Such improvements may include on or off-site culverts, detention/retention basins, channels, swales, or other structures and facilities that are determined to be necessary by the city engineer based on hydrology studies and other related information.

(Ord. 661 § 1 (610.220), 1994)

A. Whenever a subdivision contains in drainage channel or facility that is part of a city-adopted master plan of drainage, the subdivider shall construct improvements of, or contributions toward the improvement of, said facilities when one or more of the following circumstances apply:

1. The improvements are necessary to provide drainage protection for the subdivision or affected upstream or downstream properties.

2. The facility will be utilized for drainage purposes for the benefit of the subdivision.

3. The improvement of the facility is necessary to provide a logical extension of existing improvements.

B. In cases where such improvements are not solely for the benefit of the subdivision, the subdivider or developer may seek relief from sole responsibility of mitigating such drainage runoff by requesting credit or reimbursement for construction of master planned drainage facilities.

(Ord. 661 § 1 (610.230), 1994)

The perimeter of drainage structures, including but not limited to, detention/retention basins, channels and swales, shall be treated with fences, walls, landscaping, or other improvements when it is deemed necessary for protection of the public health, safety and welfare or the aesthetic qualities of the subdivision. Such improvements are subject to the approval of the director and shall be installed by the subdivider.

(Ord. 661 § 1 (610.240), 1994)

All lots within a subdivision shall be annexed into the drainage benefit assessment district to ensure the continued maintenance of drainage improvements. The developer is to pay the annexation processing fee and the first year's assessment prior to the final map being considered for approval by the director of public works.

(Ord. 754 § 1 (Attach. A § 20), 1999: Ord. 661 § 1 (610.250), 1994)